Try ubuntu-20.04 for GitHub Actions

Author: mdmintz

.github/workflows/python-package.yml

@@ -14,7 +14,7 @@ jobs:
 
     env:
       PY_COLORS: "1"
-    runs-on: ubuntu-18.04
+    runs-on: ubuntu-20.04
     strategy:
       fail-fast: false
       max-parallel: 6